Gas vs Electric Water Heaters: Pros, Cons & Costs

Choosing between a gas water heater and an electric water heater can significantly impact your home’s energy efficiency and budget. Learn which one suits your needs best.

Did you know that water heating accounts for about 18% of the energy consumption in an average North American home? This makes it the second-largest energy expense in your household, right after heating and cooling. 

With such a significant impact on your energy bills, choosing the right type of water heater is crucial. Whether you opt for a gas water heater vs electric water heater can influence not only your comfort but also your wallet. 

In this blog post, we’ll discuss both types of water heaters, their advantages and disadvantages, and help you make an informed decision for your home. When comparing electric vs gas water heaters, it’s important to consider factors such as energy efficiency, operating costs, and installation requirements.

Key Takeaways

• Gas Water Heaters:

  • Function: Use natural gas/propane to heat water via a burner and heat exchanger.

  • Types: Tankless (on-demand, energy-efficient) vs. tank models (traditional storage).

  • Pros: Faster heating, lower operating costs (~$300–$400/year), works during power outages.

  • Cons: Higher upfront cost ($1,200–$1,800+), venting requirements, gas leak risks.

  • Tankless Subtypes: Natural gas (needs gas line) or propane (requires fuel storage).

• Electric Water Heaters:

  • Function: Use electric heating elements to warm stored or on-demand water.

  • Types: Tank (lower upfront cost) vs. tankless (energy-efficient but limited flow).

  • Pros: Safer (no gas leaks), no venting, cheaper installation ($800–$1,200).

  • Cons: Slower heating, higher long-term costs (~$450–$550/year), power-dependent.

• Costs & Space:

  • Gas costs less long-term but needs venting/space; electric is compact but pricier over time.

  • Tankless (gas/electric) saves space but has higher upfront costs.

• Maintenance:

  • Gas: Annual inspections for leaks/venting; replace anode rods.

  • Electric: Flush sediment yearly; check heating elements.

• Local Factors:

  • Hamilton-specific rebates (e.g., Enbridge Gas) favor gas tankless; electric may qualify for green grants.

What is a Gas Water Heater?

A gas water heater is a popular choice for many homeowners due to its efficiency and cost-effectiveness. It operates by utilizing natural gas or propane as a fuel source to heat water. The gas is ignited in a burner, creating a flame that heats a heat exchanger. Water passes through this exchanger and absorbs the heat, becoming hot and ready for use in your home.

3 Advantages of Gas Hot Water Heaters

1. Faster Heating Times: Gas water heaters heat water more quickly than electric water heaters, ensuring a steady supply of hot water when needed.
2. Lower Operating Costs: While the initial investment might be higher, the cost of natural gas or propane is typically lower than electricity, leading to lower monthly energy bills.
3. Reliability during Power Outages: Unlike electric water heaters, gas water heaters can continue to operate during power outages, ensuring you have hot water even during emergencies.

3 Downsides of Gas Hot Water Heaters

• Higher Upfront Cost: The initial cost of purchasing and installing a gas water heater is usually higher than that of an electric model.
• Venting Requirements: Gas water heaters produce combustion gases that need to be safely vented outside, which can add complexity to the installation process.
• Potential for Gas Leaks: Although rare, there is a risk of gas leaks, which can be dangerous if not detected and addressed promptly.

The Role of Gas Water Heaters in HVAC Systems

Gas water heaters are an integral part of a home’s HVAC (Heating, Ventilation, and Air Conditioning) system, especially in homes that rely on gas for heating. They work in conjunction with other components of the HVAC system to maintain a comfortable indoor environment. By providing a consistent and reliable source of hot water, gas water heaters contribute to the overall comfort and convenience of your home.

Gas Water Heater Types

When exploring gas water heater options, homeowners typically choose between two main types: tankless gas water heater options and traditional tank gas water heaters. Each type has its own set of advantages, and the choice often depends on your household’s hot water needs, budget, and energy efficiency preferences.

Tankless Natural Gas Hot Water Heater

Tankless natural gas water heaters, also known as gas instant water heaters, are gaining popularity for their energy efficiency and space-saving design. These units heat water directly without the need for a storage tank, providing hot water on demand. This means you won’t run out of hot water during peak usage times, and you won’t waste energy heating water when it’s not needed.

Pros:

• Energy Efficiency: Tankless natural gas hot water heaters are more energy-efficient than their tank counterparts, as they only heat water when it’s needed.
• Space Saving: These units are compact and can be mounted on a wall, freeing up valuable floor space.
• Longevity: With proper maintenance, tankless gas water heaters can last up to 20 years or more.

Cons:

• Higher Initial Cost: The upfront cost of a tankless natural gas water heater is higher than a traditional tank model.
• Limited Flow Rate: While they provide a continuous supply of hot water, the flow rate might be limited, which can be a concern during simultaneous high-demand activities.

Propane Gas Tankless Water Heater

For homes without access to natural gas, propane gas tankless water heaters are an excellent alternative. They offer the same benefits as natural gas models, such as energy efficiency and on-demand hot water.

Pros:

• Versatility: Propane gas tankless water heaters can be installed in locations where natural gas is not available.
• Environmental Benefits: Propane is a clean-burning fuel, making these heaters a more environmentally friendly option.

Cons:

• Fuel Storage: You’ll need to have a propane tank installed on your property, which requires space and regular refills.
• Cost of Propane: The cost of propane can fluctuate depending on market prices, impacting operating costs.

What is an Electric Water Heater?

Electric water heaters are a common choice for many homeowners due to their simplicity and ease of use. They utilize electricity to heat water, which is then stored in a tank or heated on demand in the case of tankless models. Electric water heaters are available in various sizes and capacities to suit different household needs.

3 Advantages of Electric Water Heaters

1. Lower Upfront Cost: Electric water heaters generally have a lower initial purchase price compared to gas water heaters.
2. No Need for Venting: Unlike gas water heaters, electric models do not produce combustion gases, so venting systems are not needed
3. Safety: With no risk of gas leaks, electric water heaters are considered safer than gas models.

3 Downsides of Electric Water Heaters

1. Slower Heating Times: Electric water heaters typically take longer to heat water than gas water heaters.
2. Higher Operating Costs: Electricity rates are usually higher than natural gas rates, leading to higher operating costs for electric water heaters.
3. Dependence on Electricity: In the event of a power outage, electric water heaters will not be able to provide hot water.

In the context of HVAC systems, electric water heaters are often chosen for homes that do not have access to natural gas or for homeowners who prefer an all-electric setup. Their ease of installation and maintenance makes them a convenient option for many households.

Electric Water Heater Variants:

Electric Tank Water Heater

This traditional model stores heated water in a tank, providing a ready supply of hot water. However, due to standby heat losses, it can be less energy-efficient.

Electric Tankless Water Heater

Also known as an electric instant water heater, this model heats water on demand, providing energy savings and endless hot water, albeit with a limited flow rate.

Whichever water heating system you choose, it can be beneficial to consider further water usage improvements, add-ons such as a water purifier or an iron filter.

Maintenance Requirements for Water Heaters

Regular maintenance is key to maximizing the lifespan and efficiency of your water heater. Here’s what Hamilton homeowners need to know:

Gas Water Heaters

• Annual Inspections: Schedule professional checks for venting systems to prevent blockages (critical in Hamilton’s humid climate).

• Burner Cleaning: Dust and debris can affect efficiency; clean the burner assembly yearly.

• Gas Line Safety: Have a licensed technician inspect for leaks, especially in older Hamilton homes with aging gas lines.

• Anode Rod Replacement: Replace every 3–5 years to prevent tank corrosion from hard water common in Southern Ontario.

Electric Water Heaters

• Sediment Flushing: Drain the tank annually to remove mineral buildup from Hamilton’s moderately hard water supply.

• Heating Element Checks: Test elements every 2–3 years for wear.

• Thermostat Calibration: Ensure accurate temperature settings to avoid energy waste.

• Anode Rod Maintenance: Replace every 4–6 years for tank protection.

Tankless Systems (Gas/Electric)

• Descaling: Perform yearly to combat limescale, especially with Hamilton’s water hardness (110–120 ppm).

• Air Intake Filter Cleaning: Clear dust and lint to maintain airflow for outdoor units exposed to Ontario’s seasonal debris.

Long-Term Cost Analysis: Gas vs. Electric Water Heaters

Choosing between gas and electric? Consider these Hamilton-specific costs over 10 years:

Gas Water Heater (50-gallon tank)

• Upfront Cost: $1,200–$1,800 (unit + installation with venting).

• Annual Operating Cost: $300–$400 (based on Union Gas rates of ~$0.25/m³).

• Maintenance: $150/year (vent cleaning, inspections).

• Total 10-Year Cost: $5,700–$7,900.

Electric Water Heater (50-gallon tank)

• Upfront Cost: $800–$1,200 (lower installation fees, no venting).

• Annual Operating Cost: $450–$550 (Alectra Utilities rates of ~$0.13/kWh).

• Maintenance: $50/year (sediment flushing, element checks).

• Total 10-Year Cost: $6,300–$8,200.

Tankless Systems

• Gas Tankless: $2,500–$3,500 upfront; $200/yearoperating=$5,000–$6,500 over 10 years.

• Electric Tankless: $1,800–$2,500 upfront; ~350/year operating =  6,300–$7,500 over 10 years.

Hamilton Savings Tip: Enbridge Gas offers rebates of up to $1,000 for high-efficiency gas tankless installations. Electric models may qualify for the Canada Greener Homes Grants.

Space and Installation Logistics in Hamilton Homes

Gas Water Heaters

• Venting Requirements: Direct vent or power vent systems are mandatory. Older Hamilton homes (pre-1980s) may need chimney liner upgrades.

• Clearance: 18” minimum from walls/ceilings for safety (per Ontario Building Code).

• Indoor/Outdoor Options: Outdoor tankless models save basement space but require freeze protection for Hamilton winters.

Electric Water Heaters

• Flexible Placement: No venting needed; ideal for small spaces like condo utility closets.

• Electrical Upgrades: Older Hamilton homes may need a 240V circuit upgrade ($300–$800).

• Tankless Limitations: High-demand households may need multiple units due to Ontario’s colder groundwater temps.

Local Installation Considerations

• Permits: Hamilton requires permits for gas line modifications or electrical panel upgrades.

• Space-Saving Solutions: Tankless units are popular for downtown Hamilton row houses with limited square footage.

• Basement vs. Garage: Avoid installing units in unheated garages; Southern Ontario winters risk freezing pipes.

Making the Right Choice

Choosing between a gas water heater and an electric water heater is a decision that should be based on your specific needs, budget, and the availability of natural gas in your area. Both types have their advantages and disadvantages, so it’s important to weigh your options carefully.

If you need help deciding or require installation and maintenance services, contact us at Dynamic Heating and Cooling today. Our team of licensed technicians is here to provide fast, reliable, and competitive HVAC services, ensuring your comfort all year round.